Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.

BAROMETRIC PRESSURE SENSOR OUTPUT VOLTAGE

Vacuum - In. Hg.

⁽²⁾ Volts

3.84

3.36

2.66

1.93

1.26

.58

⁽¹⁾	Measure voltage between breakout box test pins BP and SIGRTN on Capri, or between test pins BP and GND on Festiva.

⁽²⁾	Voltage may vary by plus or minus 15 percent.

ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE

Temperature - °F (°C)

Ohms

-4 (-20)

14,600-17,800

68 (20)

2200-2700

104 (40)

1000-1300

140 (60)

500-650

176 (80)

290-350

⁽¹⁾	Measure resistance between breakout box test pins ECT and SIGRTN on Capri, or between test pins ECT and GND on Festiva.

IGNITION DIAGNOSTIC MONITOR VOLTAGE

RPM

Volts

500

1.103

1000

1.257

1500

1.542

2000

1.768

2500

2.06

3000

2.15

3500

2.26

4000

2.50

4500

2.47

5000

2.40

⁽¹⁾	Measure voltage between breakout box test pins IDM and VPWR.

THROTTLE POSITION SENSOR RESISTANCE & VOLTAGE

Throttle Opening

⁽²⁾⁽³⁾ Ohms

⁽²⁾⁽³⁾ Volts

1/8

989

.998

1/4

1104

1.60

3/8

1278

2.37

1/2

1462

2.74

5/8

1480

3.15

3/4

1459

3.43

7/8

1144

3.60

Fully Open

1072

4.02

⁽¹⁾	Measure resistance and voltage between breakout box test pins TP and SIGRTN on Capri.

⁽²⁾	Capri only. Festiva uses throttle position switch.

⁽³⁾	Resistance and voltage may vary by plus or minus 15 percent.

VANE AIRFLOW METER VOLTAGE

Door Opening

⁽²⁾⁽³⁾ Volts

1/8

3.24

1/4

5.60

3/8

5.62

1/2

5.83

5/8

6.02

3/4

6.57

7/8

7.46

Fully Open

7.87

⁽¹⁾	Measure voltage between breakout box test pins VAF and SIGRTN on Capri, or between test pins VAF and GND on Festiva.

⁽²⁾	Capri only. On Festiva, voltage should vary smoothly from .5-1.5 volts with door fully open, to 4.5-5 volts with door fully closed.

⁽³⁾	Voltage may vary by plus or minus 15 percent.

VANE AIR TEMPERATURE RESISTANCE

Temperature - °F (°C)

⁽²⁾ Ohms

-4 (-20)

15,000

32 (0)

5200

68 (20)

2500

104 (40)

1100

140 (60)

600

176 (80)

300

⁽¹⁾	Measure resistance between breakout box test pins VAT and SIGRTN on Capri, or between test pins VAT and GND on Festiva.

⁽²⁾	Resistance may vary by plus or minus 15 percent

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Engine Controls - Sensor Operating Range Charts: Introduction

Use the Manual With the Right Hardware

When to See a Mechanic

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